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If you notice on the 2nd level when yo come to the fist group of marines sargent johnston is there. I found if you kill him when you first meet him he will apear as one of the survivers ant one of the other crashed bumbelbees.[Edited on 7/8/2004 6:25:00 AM]
He reappears because story wise he wasn't ready to die. My advice to you, is to refer to the other sergent johnson topics in the forum. Or also read the 2nd and 3rd halo books.
If you also notice, the computer randomly generates Marines, it doesn't pick and choose it's favorites...Except on the TaR, all the marines in the brig are the same skin....